（毕业设计论文）《浅谈比亚迪F3汽车防抱死制动系统》.doc

精品 PAGE 内蒙古交通职业技术学院毕业设计（论文） 摘 要 在汽车防抱死制动系统出现之前，汽车所用的都是开环制动系统。其特点是制动器制动力矩的大小仅与驾驶员的操纵力、制动力的分配调节以及制动器的尺寸和型式有关。由于没有车轮运动状态的反馈信号，无法测知制动过程中车轮的速度和抱死情况，汽车就不可能据此调节轮缸或气室制动压力的大小。因此在紧急制动时，不可避免地出现车轮在地面上抱死拖滑的现象。当车轮抱死时，地面的侧向附着性能很差，所能提供的侧向附着力很小，汽车在受到任何微小外力的作用下就会出现方向失稳问题，极易发生交通事故。在潮湿路面或冰雪路面上制动时，这种方向失稳的现象会更加严重。汽车防抱死制动系统（Anti-lock Braking System简称ABS）的出现从根本上解决了汽车在制动过程中的车轮抱死问题。它的基本功能就是通过传感器感知车轮每一瞬时的运动状态，并根据其运动状态相应地调节制动器制动力矩的大小以避免出现车轮的抱死现象，因而是一个闭环制动系统。 它是电子控制技术在汽车上最有成就的应用项目之一，汽车制动防抱死系统可使汽车在制动时维持方向稳定性和缩短制动距离，有效提高行车的安全性。 关键词：ABS故障　　防抱死　　制动系统　　继电器 Abstract Before the automobile anti-lock braking system appears, the automobile uses is the split-ring braking system. Its characteristic is the brake braking moment size only with pilots control force, the braking force assignment adjustment as well as brakes size concerns with the pattern. Because does not have the wheel state of motion feedback signal, is unable to measure that knows in the brake process wheels speed and holds the dead situation, the automobile is impossible to adjust the wheel cylinder or the air chamber brake pressure size according to the above. Therefore when emergency brake, presents the wheel to hug inevitably in the ground dies tows the slippery phenomenon. When the wheel hugs dies, the ground lateral adhesion performance is very bad, can provide the lateral adhesion is very small, the automobile will receive any small external force under the function to have the direction jitter problem, extremely easy to have the traffic accident. Applies the brake when the moist road surface or the snow and ice road surface, this kind of direction jitters phenomenon can be more serious. The automobile anti-lock braking system (Anti-lock Braking System is called ABS) the appearance fundamentally solved automobiles to hold the dead question in brake process wheel. Its basic function is through the sensor sensation wheel each instant state of motion, and adjusts the brake braking the automobile applies the brake against to hug